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According to Landau quantization, the degeneracy of Landau level is approximately $n=\frac{B}{\Phi_0}$, where $\Phi_0$ is fundamental quantum of flux. My question is, as $B$ decreases, why

rather than jumping up to the next Landau level, electrons now begin to populate the localised states (David Tong's notes on QHE page 53)

? I understand that now the Landau level can hold less electrons, but what is the mechanism that change the wave function of electron?

I think this is counter intuitive, since in classical picture, decreasing $B$ makes electrons more like to pass straight thus a more "extended" state.

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